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how I connect the smoke detector with the PIC ?

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maxster03

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need your help

Hi Everyone !

I am working on a project in which i have to connect a Smoke detector with a PIC16F877, i don't want the smoke detector buzzer to sound but i want it to send the input signal to the PIC when it detects smoke, i have tested the smoke detector and it is giving a 5V to -5V square wave, the sound buzzer has 3 wires red, black and white. i calculated the volatge across red and black wires.

Can someone tell me how I connect the smoke detector (which wire) with the PIC.

Thank you so much to everyone who replies in Advance

Murtaza
 

hey,i am having the same problem like you,and my condition is much more worse than you,i dunno how to writet the source code for the system whenever the smoke detector detect the smoke and send the signal to the PIC16F877,since u already ask this question one year ago,I guess u already find a answer for it,so I hope to get the help from you in urgent,because my lecturer is forcing me to send the project to her on the next two days,if u are here,please help me,thanks..
 

jackson0215 said:
hey,i am having the same problem like you,and my condition is much more worse than you,i dunno how to writet the source code for the system whenever the smoke detector detect the smoke and send the signal to the PIC16F877,since u already ask this question one year ago,I guess u already find a answer for it,so I hope to get the help from you in urgent,because my lecturer is forcing me to send the project to her on the next two days,if u are here,please help me,thanks..
Click to expand...

Assuming you are getting the same kind of output from the smoke detector(+5V to -5V square wave) as mentioned by the OP.

First condition this signal my means for diode in order to make is compatible for uC input.

Second, you can program uC to read this input either through poll or by means of interrupt whatever works out best for your requirement.

Good luck
 

as Jack// ani said, try to make sure the signal do not change to mut ( into voltage by example, if you are using an digital IO)

All you need is some constant signal.. and thats all, why dont you post some schematic here?
 

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